Question

A solution containing a mixture of 0.0441 M 0.0441 M potassium chromate ( K 2 CrO 4 K2CrO4 ) and 0.0513 M 0.0513 M sodium oxalate ( Na 2 C 2 O 4 Na2C2O4 ) was titrated with a solution of barium chloride ( BaCl 2 BaCl2 ) for the purpose of separating CrO 2− 4 CrO42− and C 2 O 2− 4 C2O42− by precipitation with the Ba 2+ Ba2+ cation. The solubility product constants ( ? sp Ksp ) for BaCrO 4 BaCrO4 and BaC 2 O 4 BaC2O4 are 2.10× 10 −10 2.10×10−10 and 1.30× 10 −6 1.30×10−6 , respectively. Which barium salt will precipitate first? BaC 2 O 4 BaC2O4 BaCrO 4 BaCrO4 What concentration of Ba 2+ Ba2+ must be present for BaCrO 4 BaCrO4 to begin precipitating? [ Ba 2+ ]= [Ba2+]= M M What concentration of Ba 2+ Ba2+ is required to reduce the oxalate ion to 10% 10% of its original concentration? [ Ba 2+ ]= [Ba2+]= M M What is the ratio of oxalate to chromate when the Ba 2+ Ba2+ concentration is 0.0060 M 0.0060 M ? [ C 2 O 2− 4 ] [ CrO 2− 4 ] = [C2O42−][CrO42−]=

Answer 1

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